# 环境监控预警 vs 公路工程质量管理

The clearest difference is update cadence: 环境监控预警 at every 3 months against 公路工程质量管理's every 17 months. 公路工程质量管理's advantage is iOS requirement (9.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

环境监控预警 ships an update every 3 months, 公路工程质量管理 every 17 months. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | 环境监控预警 | 公路工程质量管理 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 17 months |
| Size | 146 MB | 76 MB |
| Requires iOS | 15.0 | **9.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [江苏汇环环保科技有限公司](https://appshunter.io/developer/1335902310) | [钰灵 黄](https://appshunter.io/developer/1678214624) |

## What reviewers say

### 环境监控预警

[App page](https://appshunter.io/ios/app/id1506853134)

**Features:** macOS Compatibility

**In-app purchases:** none


### 公路工程质量管理

[App page](https://appshunter.io/ios/app/id1592274281)

**In-app purchases:** none


## Frequently asked questions

### Is 环境监控预警 free?

环境监控预警 is free to download, with no in-app purchases.

### Is 公路工程质量管理 free?

公路工程质量管理 is free to download, with no in-app purchases.

### Do 环境监控预警 or 公路工程质量管理 have ads?

Neither 环境监控预警 nor 公路工程质量管理 shows ads.

### Which is updated more often, 环境监控预警 or 公路工程质量管理?

环境监控预警 ships an update every 3 months, and 公路工程质量管理 every 17 months. Most recently, 环境监控预警 was updated on November 7, 2026 and 公路工程质量管理 on November 3, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*